GNC 400 COMM TRANSCEIVER ALIGNMENT PROCEDURE
P/N 005-00051-55 REV. T
Page 10
b.
State 4 on Radio Test Set:
•
RX Mode
•
RF GEN Freq = 118.000 MHz
•
RF GEN amplitude = 2.0 uV
•
AF GEN1 to AM
•
AM DEPTH = 30%
•
AF GEN1 FREQ = 1 KHz
•
AF IN LO to GND
•
ohm/emf = emf on config page
•
RF Level Offset ON - configuration page
•
RF In/Out = -0.3 dB - configuration page
c.
Enable compressor and squelch.
d.
Increase NS SQ on the display until the squelch just opens (audio turns on).
3.5.4 Receiver Carrier Squelch Calibration - 25 KHz Mode
a.
Recall saved State 5 on the HP8920A/B.
b.
State 5 on Radio Test Set:
•
RX Mode
•
RF GEN Freq = 118.000 MHz
•
RF GEN amplitude = 12.5 uV
•
AF GEN1 to AM
•
AM DEPTH = 85%
•
AF GEN1 FREQ = 8 KHz
•
AF IN LO to GND
•
ohm/emf = emf on config page
•
RF Level Offset ON - configuration page
•
RF In/Out = -0.3 dB - configuration page
c.
Enable compressor and squelch.
d.
Decrease SQ 250 on the display until the squelch just opens (audio turns on).
e.
Increase SQ 250 one level.
